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I'm just bad at writing bikes, why do you have to turn everything into a confrontation to show how clever you are?
What size cable for connecting 12v batteries?
- Thread starter woodman-46
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The XLR connector pictured is rated up to 50V at 16A. Charging voltage as mentioned previously would be higher than this so it is not ideal. I would be more tempted to use an XT60 connector which has a much higher current rating. You can either use the connectors in-line or get panel mount kits such as https://hobbyking.com/en_us/xt60-panel-mounting-kit.html.
I would also put a diode in series with the charging lead to the batteries to protect against the charger being connected incorrectly (not that the XT60 can be plugged in the wrong way round) and also stop anything from being able to short the charging connector. Just adjust the battery charger voltage to compensate for the approx 0.6V drop across the diode.
I would also put a diode in series with the charging lead to the batteries to protect against the charger being connected incorrectly (not that the XT60 can be plugged in the wrong way round) and also stop anything from being able to short the charging connector. Just adjust the battery charger voltage to compensate for the approx 0.6V drop across the diode.
If I understand John's point correctly, despite your saying "only a 1hp engine", I think he is probably suggesting that such an engine might be too powerful for it to necessarily be 'safe' to ride, particularly for a child! I haven't got a clue as to whether or not that is a justified concern and, in any event, I may have misunderstood him.
Kind Regards, John
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Actually I was saying if it were stuck on full power on full charge I'd probably be thrown off before it ran flat!
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Isn't that essentially what I interpreted your comment to be saying?
Kind Regards, John
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I wasn't saying it was dangerous, I was more meaning diversity would probably apply quite heavily to both the cables and battery life, as no one would be riding it that hard as they'd fall off if they're anything like me! But I think the point was lost through the internet.
That's roughly what I thought you meant - after all, 'falling off' (whilst riding the device 'hard') has the potential to be 'dangerous'!
Kind Regards, John
Falling off a 1hp horse is very dangerous.
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Thanks all for your advice and input.
Although 800w sounds very powerful it is the same hub motor used on electric bikes albeit for people who want their bike to be able to tackle hills etc. It was bought with the advice of the seller (reputable) who said this motor would give a good but safe speed on this small motorbike and I will be fitting a three speed selector so that my son can get used to it. It is actually less powerful than a 1000w electric quad he had once that reached a top speed of no more than 25 kmh (about 18 mph) so not really that fast and in a field was not over the top. I appreciate your concern though.
On the subject of the quad , it ran on 4 x 12v 15 ah lead acid batteries and all the batteries were in series and the 48v charger it came with charged them at the same time and the same with an old golf buggy we had once. 48 v chargers are easy to buy from golf buggy companies, ebay or Amazon would these not be ok? The charger I mean is as in photo in previous message. Thanks
Although 800w sounds very powerful it is the same hub motor used on electric bikes albeit for people who want their bike to be able to tackle hills etc. It was bought with the advice of the seller (reputable) who said this motor would give a good but safe speed on this small motorbike and I will be fitting a three speed selector so that my son can get used to it. It is actually less powerful than a 1000w electric quad he had once that reached a top speed of no more than 25 kmh (about 18 mph) so not really that fast and in a field was not over the top. I appreciate your concern though.
On the subject of the quad , it ran on 4 x 12v 15 ah lead acid batteries and all the batteries were in series and the 48v charger it came with charged them at the same time and the same with an old golf buggy we had once. 48 v chargers are easy to buy from golf buggy companies, ebay or Amazon would these not be ok? The charger I mean is as in photo in previous message. Thanks
Perfectly fine, and exactly what you would use.
Charging lead acid cells in series is not a big deal and won't damage anything - it happens all the time in equipment that uses such things, forklift trucks, milk floats and such things in the past.
Even in a normal car the battery is 6 cells in series, all charged at the same time from a single voltage source.
The situation with lithium cells is different, and they can be damaged by even small over/under voltages.
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Ever seen the film"speed"? Suddenly things get more scary when you can't stop! Although the bomb on board probably didn't help...
Basically treat the group of 4 batteries as "one unit" - so the only connections you make to it are the two on the right, the links between the batteries are internal to the "48V battery" in the same way as the inter-cell links are inside the 12V blocks which are themselves 6 cells with 5 internal links making them one battery.
As to where to put the fuse, it doesn't really matter as the same current flows all round the circuit - so a matter of where is most convenient. In some of the UPS units I deal with, they have two 12V blocks (for a 24V system) and use the fuse as the link between them (some of them, literally bolted between the terminals).
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